Climate averages 1991–2020
Jeju City weather
in December.
A cool, moderately wet month: the 10th warmest and the 2nd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cool month in Jeju City: daytime highs average 10.5°C and nights cool to about 6.8°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 68 mm of rain on roughly 11 days, which makes December a moderately wet month (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 59 min on an average December day.
The nearest other city in this atlas is Seogwipo (29 km away). In December its highs average 10.5°C, about as warm as Jeju City, with 55 mm of rain.
Among the 79 cities listed in South Korea, Jeju City ranks joint 1st of 79 for the warmest December highs and 79th of 79 for the driest December (rainfall, lowest first). The mean December high of those 79 cities is 5.6°C; Jeju City is 4.9°C warmer than that mean.
From December to January, average highs fall by 2.4°C to 8.0°C, and monthly rainfall rises from 68 mm to 73 mm.
The annual picture
December in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Jeju City climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.0°C4.7°C | 4.7°C | 73 | 11.7 | 10.210 h |
| February | 9.1°C5.0°C | 5.0°C | 65 | 9.4 | 11.011 h |
| March | 12.2°C7.5°C | 7.5°C | 94 | 10.3 | 12.012 h |
| April | 16.4°C11.4°C | 11.4°C | 102 | 8.9 | 13.013 h |
| May | 20.1°C15.5°C | 15.5°C | 109 | 8.8 | 13.914 h |
| June | 23.5°C19.7°C | 19.7°C | 189 | 11.5 | 14.314 h |
| July | 27.6°C24.3°C | 24.3°C | 184 | 12.1 | 14.114 h |
| August | 28.7°C25.7°C | 25.7°C | 168 | 13.7 | 13.413 h |
| September | 25.3°C22.3°C | 22.3°C | 165 | 11.1 | 12.412 h |
| October | 20.7°C17.4°C | 17.4°C | 79 | 6.7 | 11.411 h |
| November | 15.8°C11.9°C | 11.9°C | 70 | 8.8 | 10.510 h |
| December, selected | 10.5°C6.8°C | 6.8°C | 68 | 11.0 | 10.010 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Seogwipo in DecemberSouth Korea · 29 kmHigh 10.5°C · Low 6.2°C · 55 mm rain
- Mokpo in DecemberSouth Korea · 145 kmHigh 7.4°C · Low 2.0°C · 36 mm rain
- Muan in DecemberSouth Korea · 165 kmHigh 7.4°C · Low 0.8°C · 26 mm rain
- Yeosu in DecemberSouth Korea · 174 kmHigh 7.9°C · Low 2.1°C · 31 mm rain
- Masan in DecemberSouth Korea · 182 kmHigh 7.1°C · Low -1.0°C · 29 mm rain
- Suncheon in DecemberSouth Korea · 183 kmHigh 7.8°C · Low -0.7°C · 28 mm rain
- Gwangju in DecemberSouth Korea · 186 kmHigh 6.8°C · Low -1.3°C · 30 mm rain
- Kwangyang in DecemberSouth Korea · 190 kmHigh 7.8°C · Low -0.2°C · 28 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Jeju City) is explained once on the Jeju City year overview and on the Sources, method and limits page.